[TowerTalk] FCC RF Safety Regs Info Sept 1

[Michael Tope]

If you look at the exposure guidelines published on the league's
website, the minimum "safe" distance for uncontrolled exposure gets 
pretty small as the frequency goes down. For 1.5 KW at 3.8 MHz its 
something like 8 feet (3dBi antenna). Since the numbers appear to scale 
with frequency and the square root of power (field intensity), at 
750 KHz/50 KW the minimum safe distance from a 3dBi antenna would 
be  around 9 feet (the frequency term nearly cancels the power term).
Of course, I don't know how useful these figures are at low frequencies 
where the minimum safe distances are well into the near field of the 
antenna, but they do seem to be enough to satisfy the FCC. 

Mike, W4EF...............................................................................................

----- Original Message ----- 
From: "Bill Coleman AA4LR" <aa4lr@radio.org>
To: <TOWERTALK@contesting.com>
Sent: Tuesday, September 12, 2000 12:06 PM
Subject: Re: [TowerTalk] FCC RF Safety Regs Info Sept 1


> 
> On 9/10/00 10:08 AM, n4kg@juno.com at n4kg@juno.com wrote:
> 
> >Anybody know of any health problems among people who
> >work at AM Broadcast stations which run from 1KW to
> >50KW,  CONTINUOUSLY, day in and day out?
> >
> >I don't.
> 
> Hmmm. WSB here in Atlanta has a transmitting tower that USED TO BE out in 
> the  boonies. Over time, Altanta expanded and eventually a SHOPPING MALL 
> was erected around the WSB tower. 
> 
> It stands there today. 50 kW of power at 750 kHz day and night, in the 
> middle of the parking lot for the mall. You can't get within about 50 
> feet of the tower, because of a protective wall, but most of the shopping 
> complex is within range of the guy wires.
> 
> If that isn't an "uncontrolled" space, I don't know what is....
> 
> 
> 
> Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr@radio.org
> Quote: "Boot, you transistorized tormentor! Boot!"
>             -- Archibald Asparagus, VeggieTales
> 
> 
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> 


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